Records of daily weather conditions and growth yielded no correlation with radiation and temperature and with precipitation, except after drought. Increase in circumference was positively correlated with the length of period with a limited evaporation and transpiration. Growth therefore took place during the night while dry and hot days decreased bulb size.
In conclusion the most favourable conditions for bulb production were an early winter and a long cool spring, and circumstances limiting transpiration of the crop. Of these environmental conditions only evaporation could be influenced and for this purpose shelter belts of conifers were recommended.
|Qualification||Doctor of Philosophy|
|Award date||8 Jul 1960|
|Place of Publication||Wageningen|
|Publication status||Published - 1960|
- ornamental bulbs